MDV MDCA3-12HRDN1, Service Manual

Page: 117 / 143

MDCA3-18HRDN1
Troubleshooting
208 Electrical Control System
For Super-slim 4-way Cassette &
NO. Malfunction
Running
lamp
Timer
lamp
Defrosting
lamp
Alarm
lamp
Display(digital
tube)
1
Communication malfunction between indoor
and outdoor units.
X
☆
X X E1
2
Open or short circuit of T1 temperature
sensor
☆
X X X E2
3
Open or short circuit of T2 temperature
sensor
☆
X X X E3
4
Open or short circuit of T2B temperature
sensor
☆
X X X E4
5 Water-level alarm malfunction X X X ☆ EE
6 Indoor EEPROM malfunction
◎
X X X E7
7 Outdoor unit malfunction X X X
◎
Ed
8 Indoor fan speed is out of control
☆ ☆
X X E8
9
Communication malfunction between main
PCB and up-down panel PCB
☆ ☆ ☆ X F0
10 Up-down panel malfunction
☆ ☆
X
☆
F1
11 Up-down panel is not closed ☆ ☆ X O F2
12
Communication malfunction between master
unit and slave unit
X
☆
X
☆
F3
13 Other malfunction of master unit or slave unit X
☆ ☆
X F4
O (on) X(off)
☆
(flash at 5Hz)
◎
(flash at 0.5Hz)
F0,F1,F2 are only available for super-slim cassette with up-down panel
For GA floor standing:
Codes Contents
P0 Evaporator low temp. protection
P1 Defrosting or anti-cold air
Ed Outdoor unit protection / Open or short circuit of outdoor temp. sensor
E1 Indoor / outdoor units communication error
E2 Open or short circuit of T1 temperature sensor
E3 Open or short circuit of T2 temperature sensor
E4 Open or short circuit of T2B temperature sensor
E7 EEPROM malfunction